Other people are explaining why you're wrong, but I'd like to point out that even if you were right, your comment would still be nearly worthless. Merely point

Other people are explaining why you're wrong, but I'd like to point out that even if you were right, your comment would still be nearly worthless. Merely pointing out that someone else isn't correct might even have negative net value. For one thing, it can be construed as simple disagreement, opening up a debate that shouldn't happen when there really is a definitive answer. For another, it's insulting (especially as you did it) and that's not a necessary part of correcting someone's understanding. Invest a few more minutes next time to actually make a substantive comment. You'll be helping the person you correct, you'll be helping whoever else reads the thread, and you'll ultimately be helping yourself – by opening up your views to an actual constructive process.